spandsp  0.0.6
private/modem_echo.h
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1 /*
2  * SpanDSP - a series of DSP components for telephony
3  *
4  * private/modem_echo.h - An echo cancellor, suitable for electrical echos in GSTN modems
5  *
6  * Written by Steve Underwood <steveu@coppice.org>
7  *
8  * Copyright (C) 2001, 2004 Steve Underwood
9  *
10  * Based on a bit from here, a bit from there, eye of toad,
11  * ear of bat, etc - plus, of course, my own 2 cents.
12  *
13  * All rights reserved.
14  *
15  * This program is free software; you can redistribute it and/or modify
16  * it under the terms of the GNU Lesser General Public License version 2.1,
17  * as published by the Free Software Foundation.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22  * GNU Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this program; if not, write to the Free Software
26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27  */
28 
29 /*! \file */
30 
31 #if !defined(_SPANDSP_PRIVATE_MODEM_ECHO_H_)
32 #define _SPANDSP_PRIVATE_MODEM_ECHO_H_
33 
34 /*!
35  Modem line echo canceller descriptor. This defines the working state for a line
36  echo canceller.
37 */
39 {
40  int adapt;
41  int taps;
42 
43  fir16_state_t fir_state;
44  /*! Echo FIR taps (16 bit version) */
45  int16_t *fir_taps16;
46  /*! Echo FIR taps (32 bit version) */
47  int32_t *fir_taps32;
48 
49  int tx_power;
50  int rx_power;
51 
52  int curr_pos;
53 };
54 
55 #endif
56 /*- End of file ------------------------------------------------------------*/
int16_t * fir_taps16
Definition: private/modem_echo.h:45
Definition: fir.h:45
Definition: private/modem_echo.h:38
int32_t * fir_taps32
Definition: private/modem_echo.h:47